Should I give up my present job and spend a year studying English full-time?
First of all, it depends on your demand for English. If you study for a year, you can make rapid progress, your career can be promoted quickly, or you can realize your dreams (such as studying abroad or emigrating). That's ok, but if you don't have to live without English, you can study while working or find a part-time job. After all, the social pressure is so great now, if there is no work and life. But if you still have a lot of savings, you can consider concentrating on your studies. Now I feel it is a pleasure to have time to concentrate on my studies.